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Phylogenetic Position of an Uncharacterized Brazilian Strain of Bovine Papillomavirus in the Genus Xipapillomavirus Based on Sequencing of the L1 Open Reading Frame

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Phylogenetic Position of an Uncharacterized Brazilian Strain of Bovine Papillomavirus in the Genus Xipapillomavirus Based on Sequencing of the L1 Open Reading Frame Genetics and Molecular Biology, 33, 4, 745-749 (2010) Copyright © 2010, Sociedade Brasileira de Genética. Printed in Brazil www.sbg.org.br Short Communication Phylogenetic position of an uncharacterized Brazilian strain of bovine papillomavirus in the genus Xipapillomavirus based on sequencing of the L1 open reading frame Michele Lunardi1, Marlise P. Claus1, Amauri A. Alfieri1, Maria Helena P. Fungaro2 and Alice F. Alfieri1 1Laboratório de Virologia Animal, Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina, Londrina, PR, Brazil. 2Laboratório de Genética Molecular, Departamento de Biologia Geral, Universidade Estadual de Londrina, Londrina, PR, Brazil. Abstract The use of PCR assays with degenerate primers has suggested the existence of numerous as yet uncharacterized bovine papillomaviruses (BPV). Despite the endemic nature of BPV infections, the identification of BPV types in Bra- zilian cattle is still only sporadic. However, in a recent analysis of a partial segment of the L1 gene, we observed nota- ble diversity among the BPV types detected. The aim of this study was to determine the phylogenetic position of the previously identified wild strain BPV/BR-UEL2 detected in the state of Paraná in Brazil. Since previous analysis of the partial L1 sequence had shown that this strain was most closely related to BPV type 4, genus-specific primers were designed. Phylogenetic analysis using complete L1 ORF sequences revealed that BPV/BR-UEL2 was related to BPV types classified in the genus Xipapillomavirus and shared the highest L1 nucleotide sequence similarity with BPV type 4 (78%). This finding suggests that BPV/BR-UEL2 should be classified as a potential new type of BPV in the genus Xipapillomavirus. Key words: BPV, cattle, cutaneous papillomatosis, putative new BPV type, L1 gene. Received: March 26, 2010; Accepted: July 8, 2010. Papillomaviruses (PVs) are a highly diverse group of in the genera Deltapapillomavirus (BPV-1 and -2), Xipa- circular double-stranded DNA viruses that can induce epi- pillomavirus (BPV-3, -4, and -6) and Epsilonpapillo- thelial proliferation in a wide range of vertebrate species. In mavirus (BPV-5) (De Villiers et al., 2004). In addition, the cattle, the bovine papillomavirus (BPV) has been impli- most recently characterized BPV types were placed in cated as the casual agent of cutaneous papillomatosis and Epsilonpapillomavirus (BPV-8) and Xipapillomavirus cancer of the urinary bladder and upper gastrointestinal (BPV-9 and -10), with the exception of BPV-7, which be- tract (Campo, 2002). longs to an as yet undesignated PV genus (Ogawa et al., Recently, based on a comparison of the entire L1 nu- 2007; Tomita et al., 2007; Hatama et al., 2008). cleotide sequence of almost all known PVs, the family As observed for HPV, PCR assays using degenerate Papillomaviridae was found to consist of 18 genera primers that amplify partial fragments of the L1 gene, fol- (Alphapapillomavirus to Sigmapapillomavirus), each con- lowed by sequencing, have demonstrated the presence of taining a number of species. The different genera show less numerous BPV types in cattle herds from diverse geo- than 60% identity in the L1 nucleotide sequence, whereas graphical regions. Using the primers FAP59/FAP64 and species within a genus share 60%-70% identity. In addi- MY09/MY11, 12 putative new BPV types were detected in tion, traditional types within a species show 71%-89% teat skin warts and healthy teat skin of cattle from Japan and identity in the same gene (De Villiers et al., 2004). Sweden (Forslund et al., 1999; Antonsson and Hansson, While more than 100 human papillomavirus (HPV) 2002; Ogawa et al., 2004). types have been identified, only six BPV types had been de- A recent investigation using the strategy above re- scribed in cattle before 2007. These BPVs were classified vealed notable diversity among BPV types detected in papillomas of four cattle herds from the state of Paraná in Send correspondence to Alice Fernandes Alfieri. Laboratório de southern Brazil. The study also identified four putative new Virologia Animal, Departamento de Medicina Veterinária Preven- BPV types designated as BPV/BR-UEL2 to BPV/BR- tiva, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, PR 445, km 380, Caixa Postal 6001, 86051-990 Londrina, PR, UEL5 (GenBank accession numbers EU293538 to Brazil. E-mail: [email protected]. EU293541, respectively) (Claus et al., 2008). The aim of 746 Lunardi et al. the current study was to determine the phylogenetic posi- 1.5 mM MgCl2 and ultrapure sterile water in a final volume tion of BPV/BR-UEL2 in relation to other BPVs. of 25 mL. The reactions were run in a PTC-200 thermo- BPV/BR-UEL2 DNA was isolated from a rice- cycler (MJ Research Co., USA) using the following times grain-sized papilloma located in the axillary region of a and temperatures: 10 min at 94 °C followed by 40 cycles of cow from a dairy cattle herd in Paraná (Claus et al., 2008). 1 min at 94 °C, 1 min at an optimum temperature for primer The papilloma was homogenized in phosphate-buffered sa- annealing, 1 min at 72 °C, and a final extension of 10 min at line (PBS, pH 7.2) and the homogenate (10% w/v) then 72 °C. The annealing temperatures for primer pairs centrifuged (1500 x g, 15 min, 4 °C). An aliquot (250 mL) of L2Bf/FAP64, L2Bf/L1Br and L1Bf/LCRBr were 50 °C, the supernatant was treated with lysis buffer [10 mM Tris, 54 °C and 57 °C, respectively. The amplified products were 1 mM EDTA, 0.5% Nonidet P40, 1% SDS and 0.2 mg/mL analyzed by electrophoresis in 1.5% agarose ethidium bro- proteinase K (Invitrogen, Life Technologies, USA)], mixed mide stained gels in TBE buffer, pH 8.4 and examined un- and incubated at 56 °C for 30 min. der UV light. DNA was extracted using a combination of the phe- Initially, all PCR products were purified using a nol/chloroform/isoamyl alcohol and silica/guanidine iso- PureLink quick gel extraction kit (Invitrogen) and then thiocyanate methods (Alfieri et al., 2006). The DNA was cloned using TOPO TA cloning kit for sequencing (Invi- eluted in 50 mL of ultrapure (MilliQ®) sterile water and trogen), according to the manufacturer’s instructions. The stored at -20 °C until used. An aliquot of ultrapure sterile inserts from two clones selected for each PCR amplicon water was included as a negative control in the DNA ex- were then sequenced using DYEnamic ET dye terminator traction procedure. cycle sequencing kit (GE Healthcare, Little Chalfont, UK) with M13 forward and reverse primers in a MegaBACE Since FAP sequence analysis of the wild type 1000/Automated 96 Capillary DNA sequencer (GE BPV/BR-UEL2 (GenBank accession number EU293538) Healthcare), according to the manufacturer’s instructions. has shown that this isolate is most closely (77%) related to The sequences obtained were examined with the PHRED BPV type 4, sequences from the L2, L1 and LCR regions of application for quality analysis of chromatogram read- Xipapillomavirus representatives (BPV-3, -4 and -6) were ings. The sequences were accepted if base quality aligned and used to design degenerate primers to obtain the was ³ 20. The consensus sequence was determined using entire L1 nucleotide sequence. CAP3 software and the sequence identity was verified Combinations of the two primer sets (L2Bf/L1Br and against all sequences deposited in GenBank using the L1Bf/LCRBr) and the previously described FAP primer BLAST application. The L1 ORF of Brazilian wild type pair were tested (see Table 1 for primer features) (Forslund BPV was predicted based on analysis with the ORF Finder et al., 1999). In addition, the same primer sets were also tool. The alignment and degree of similarity among se- tested on DNA samples known to harbor BPV type 6, a quences at the nucleotide and amino acid levels were de- Xipapillomavirus representative. Sequence alignment and termined using BIOEDIT v 5.0.9 software (Hall, 1999). primer design were done using the CLUSTAL W Multiple The phylogenetic tree was constructed using MEGA v. 3.1 Alignment program and Gene Runner v 3.05 (Hastings software (Kumar et al., 2004) and the neighbor-joining Software Inc., Hastings, NY), respectively (Thompson et method with the Kimura two-parameter distance estimate al., 1994). (Kimura, 1980). Bootstrap support values were deter- The PCR reactions contained 2.5 mL of extracted mined for 1000 replications. DNA, 20 pmol of each primer, 200 mM of each dNTP, The first L1 segment of the Brazilian wild strain 2.5 U of Platinum Taq DNA polymerase (Invitrogen), 1 x BPV was obtained using a semi-nested PCR assay (SN- PCR buffer (20 mM Tris-HCl, pH 8.4 and 50 mM KCl), PCR) with the primer pair L2Bf/FAP64 in the first round Table 1 - Sequences and features of primers used in the polymerase chain reactions. Primer Genomic region targeted Polarity Sequence1 Nucleotide positions2 Degree of degeneracy L2Bf L2 + 5’GTIAARYTITTYATHAAYGAYGC3’ 5385-5407 96 FAP593 L1 + 5’TAACWGTIGGICAYCCWTATT3’ 5729-5749 8 L1Br L1 - 5’AASACTCTGAATTGACTGCC3’ 5794-5813 2 L1Bf L1 + 5’GRGAGCAYTGGGAYAAAG3’ 6089-6106 8 FAP643 L1 - 5’CCWATATCWVHCATITCICCATC3’ 6175-6197 36 LCRBr LCR - 5’CWRCATTTTATTKSSAASATTC3’ 7181-7202 64 1Degenerate nucleotides: I = inosine;R=G,A;Y=T,C;H=A,T,C;W=A,T;S=G,C;V=G,A,C;K=G,T. 2Relative position in the BPV-4 genome. 3Forslund et al. (1999). Phylogenetic position of a Brazilian BPV 747 and the primer pair L2Bf/L1Br in the second round, which yielded an amplicon of 435 bp. Use of the FAP59/FAP64 (475 bp) and L1Bf/LCRBr (1128 bp) primer sets allowed amplification of the remaining portions of the same gene (Figure 1). A consensus sequence of 1804 nt (GenBank acces- sion number GQ471901) spanning nt 5385 to nt 7184 of BPV-4 was obtained with the L2Bf/L1Br, FAP59/FAP64 and L1Bf/LCRBr overlapping amplicons of the BPV/BR- UEL2 isolate.
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